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Benzene and its derivatives.

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Octane Number

A number that indicates how smoothly a gasoline burns.

Natural Radioactivity

Spontaneous decomposition of an atom.

Electrode Potentials

Potentials, E, of half-reactions as reductions versus the standard hydrogen electrode.

Liquid Aerosol

Colloidal suspension of liquid in gas.

Effective Molality

The sum of the molalities of all solute particles in a solution.

Reaction Quotient

The mass action expression under any set of conditions (not necessarily equlibrium), its magnitude relative to K determines the direction in which the reaction must occur to establish equilibrium.

Zinc

Discovered: known in India and China before 1500 and to the Greeks and Romans before 20 BC as the copper-zinc alloy brass
Origin: The name is derived from the German ‘Zink’.
Atomic no: 30
Mass No: 65
Description: A grey metal with a blue tinge. World production exceeds 7 million tons a year, and it is used to galvanise iron to prevent it rusting. It is also employed in alloys and batteries, and as zinc oxide to stabilise rubber and plastics. Zinc is essential for all living things, and is important for growth and development. The average human body contains about 2.5 grams and takes in about 15 milligrams per day. Some foods have above average levels of zinc, including herring, beef, lamb, sunflower seeds and cheese.

Condensed States

The solid and liquid states.

Salt Bridge

A U-shaped tube containing electrolyte, which connects two half-cells of a voltaic cell.

Chemical Kinetics

The study of rates and mechanisms of chemical reactions and of the factors on which they depend.